Instance parsing: Uboot boot for non-Linuxkernel boot

& Nbsp; enables uboot to boot non-linuxkernel. Although there is an IH_TYPE_STANDALONE, it is not implemented. Nnd. You can only find a solution by yourself. For implementation details, see the following. 1. two commands: setbootcmdtftp84000000uImage; bootm84000000setbootdelay12  

Provides uboot guidance for non-linux kernel. Although there is an IH_TYPE_STANDALONE, it is not implemented. Nnd. You can only find a solution by yourself. For implementation details, see the following.

1. two commands

Set bootcmd tftp 84000000 uImage; bootm 84000000

Set bootdelay 1

2. non-linux kernel pilot implementation method:

There are three functions in total: jump, selectboot, and system_boot.

Place the jump in the place where you want to jump. the parameter is the address to jump. Then return and restart the system. Select is placed at the beginning of main. The redirection is implemented by judging the specific information of a specific ram address.

System_boot to restart the system

#define FDMA_SRAM_TOP_ADDRESS 0xB9229800#define MAGIC_NUM 0x71097100#define DEAD_PATTERN 0xBAD0BADF#define ST40_CPG_REGS_BASE 0xFFC00000#defineST40_CPG_WTCNT (ST40_CPG_REGS_BASE + 0x08)#define ST40_CPG_WTCSR (ST40_CPG_REGS_BASE + 0x0C)#define ST40_CPG_WTCSR2 (ST40_CPG_REGS_BASE + 0x1C)void Jump(unsigned int address){STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*1, MAGIC_NUM);STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*2, address);STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*3, ~address);STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*4, ~MAGIC_NUM); STSYS_WriteRegDev16LE(ST40_CPG_WTCNT, 0x5AF0); /*Watchdog counter*/STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA547); /*Watchdog control*/STSYS_WriteRegDev16LE(ST40_CPG_WTCSR2, 0xAA00); /*Watchdog control2*/ STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA5C7); /*Start watchdog counter*/ for(;;);}void SelectBoot(void){unsigned int MagicNum = 0;unsigned int NotMagicNum = 0;unsigned int JumpAddress = 0;unsigned int NotJumpAddress = 0; void (*entry)(void);/* entry=0xa0100000;entry();*/ //if((STSYS_ReadRegDev16LE(ST40_CPG_WTCSR2) & 0xFF) != 0x0){MagicNum = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*1);JumpAddress = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*2);NotJumpAddress = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*3);NotMagicNum = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*4); if((MagicNum == MAGIC_NUM)&& (MagicNum == (~NotMagicNum))&& (JumpAddress == (~NotJumpAddress))){entry = (void (*)(void))JumpAddress;STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*1, DEAD_PATTERN);STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*2, DEAD_PATTERN);STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*3, DEAD_PATTERN);STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*4, DEAD_PATTERN); #if 0/*Setup For watchdog in case jump failed.*/STSYS_WriteRegDev16LE(ST40_CPG_WTCNT, 0x5AF0);STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA543);STSYS_WriteRegDev16LE(ST40_CPG_WTCSR2, 0xAA01); STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA5C7);#endif entry(); while(1);}}}void system_reboot(void){ulong sr;asm ("stc sr, %0":"=r" (sr));sr |= (1 << 28); /* set block bit */asm ("ldc %0, sr": :"r" (sr));asm volatile ("trapa #0");}